An angular displacement micro-driving mechanism

Abstract

An angular displacement micro-drive mechanism, belonging to the technical field of mechanical design and manufacturing, includes an input shaft (1), a hollow shaft (2), Gear I (3), snap rings (4), snap rings (5), a sleeve (6), Gear IV (7), a power output shaft (8), a sleeve (9), bearings (10), bearing covers (11), bolts (12), a rotating workbench (13), bearings (14), bearings (15), end cover bolts (16), Gear III (17), a bushing (18), an intermediate shaft (19), a planet carrier (20), Gear II (21), a sleeve (22), a bracket (23), bearings (24), bearing covers (25), bolts (26), bearings (27), bearing covers (28), a worm gear (29), a worm (30), a sealing ring (31), bolts (32), a retaining ring (33), spring washers (34), nuts (35), and a housing (36), and can achieve precise angular displacement transmission.

Description

Technical Field

[0001] The present invention belongs to the technical field of mechanical design and manufacturing, and particularly relates to an angular displacement micro-driving mechanism. Background Art

[0002] The surface topography formed after machining of mechanical parts has a great influence on the friction characteristics, contact stiffness, fatigue strength, fit, vibration and running accuracy of the parts. The microscopic topography of the machined surface of the workpiece is directly an important index for judging the quality of the workpiece. For example, in the mechanical industry. Therefore, it is of great significance to measure the microscopic topography of the surface of the workpiece. In order to obtain the microscopic topography of the workpiece surface, a white light interference profilometer using a non-contact measurement method is a precision instrument for obtaining parameters such as the surface roughness of the workpiece with high precision. When measuring the roughness of the workpiece using a white light interference profilometer, a precision micro-rotating workbench is required, but it cannot be achieved at present. With the development of optical fiber communication and optical fiber sensing technologies, a precision angular displacement micro-motion mechanism is also required in the preparation of optoelectronic devices. However, the current micro-motion angular displacement mechanism is difficult to meet the required precision requirements and has a relatively high price. Therefore, there is an urgent need to design an angular displacement driving mechanism that can achieve precision micro-driving. Summary of the Invention

[0003] The object of the present invention is: in order to achieve precision angular displacement micro-driving and solve the problem of the current lack of a precision angular displacement driving mechanism, an angular displacement micro-driving mechanism that can achieve precision micro-rotation is provided.

[0004] To achieve the above object, the technical solution of the present invention is: an angular displacement micro-driving mechanism, including an input shaft, a hollow shaft, Gear I, Snap Ring I, Snap Ring II, Sleeve I, Gear IV, a power output shaft, Sleeve II, Bearing I, Bearing End Cover I, Bolt I, a rotating workbench, Bearing II, Bearing End Cover II, Bolt II, Gear III, a shaft sleeve, an intermediate shaft, a planetary carrier, Gear II, Sleeve III, a bracket, Bearing III, Bearing End Cover III, Bolt III, Bearing IV, Bearing End Cover IV, a worm gear, a worm, a sealing ring, Bolt IV, a retaining ring, a spring washer, a nut, and a housing. It is characterized in that: the hollow shaft passes through the shaft hole of the housing and is fixed to the housing by the fixed shaft section and the fixed boss on the hollow shaft with Bolt IV. Bolt IV also fixes Bearing End Cover IV. Gear I is installed on Spline II on the hollow shaft through splines and is pressed against the hollow shaft boss on the hollow shaft by Snap Ring I. Gear II and Gear I are in backlash-free meshing, and backlash-free meshing can ensure precise transmission accuracy. The hollow shaft is of a hollow shape. The input shaft is installed on the housing through the hollow shaft by Bearing IV. The worm gear is fixed to the end of the input shaft by Snap Ring II. The worm gear meshes with the worm. Both ends of the worm are installed on the housing through bearings, and the worm can rotate freely relative to the housing. The planetary carrier is installed on Spline I on the input shaft by internal splines and is pressed against the input shaft boss on the input shaft by Snap Ring II. The shaft section of the power output shaft is installed in the light hole of the input shaft. The shaft section of the power output shaft and the light hole of the input shaft are in transition fit, and transition fit can ensure precise transmission accuracy. Gear IV is installed on Spline III on the power output shaft through splines and is pressed against the power output shaft boss on the power output shaft by Sleeve I. The power output shaft is installed on the housing through Sleeve II and Bearing I. Bearing End Cover I is fixed to the housing by Bolt I and pressed against the outer ring of Bearing I. The other end of the power output shaft has an external thread. The rotating workbench is installed on the external thread of the power output shaft and is fastened to the power output shaft by a nut, a spring washer, and a retaining ring. The rotating workbench consists of a fixed seat, a thin spring plate, and a workbench. The thin spring plate connects the fixed seat and the workbench. When performing angular displacement drive, the power output shaft drives the fixed seat to rotate, and the fixed seat drives the workbench to rotate through the thin spring plate. The thin spring plate can eliminate vibrations during movement and improve transmission precision. The left end of the intermediate shaft is installed in the inner ring of Bearing II. The outer ring of Bearing II is installed on the bracket. Bearing End Cover II is fixed to the bracket by Bolt II and pressed against the outer ring of Bearing II. The right end of the intermediate shaft is installed in the inner ring of Bearing III. The outer ring of Bearing III is installed on the bracket. Bearing End Cover III is fixed to the bracket by Bolt III and pressed against the outer ring of Bearing III. The intermediate shaft is designed with a long spline and a short spline. Gear III is matched with the long spline on the intermediate shaft through splines. The preferred spline form is an involute spline, and the involute spline has good centering property and improves the installation accuracy. Gear II is installed at the short spline of the intermediate shaft and is pressed against the intermediate shaft boss on the intermediate shaft by Sleeve III and the inner ring of Bearing III.A planet carrier is installed on the optical axis section of the intermediate shaft. The optical hole of the planet carrier and the optical axis section of the intermediate shaft are in transitional fit to ensure that the optical hole is in close contact with the intermediate optical axis section and can rotate relative to each other freely. During operation, the driving force is transmitted from the worm to the worm gear and then through the worm gear to the planetary mechanism driven by the input shaft.

[0005] The beneficial effects of this invention patent are as follows: By combining the worm and worm gear with the planetary gear drive, this invention generates a large transmission ratio to achieve rotation of nano-level micro angular displacement. The angular displacement micro drive mechanism of this invention is a purely mechanical angular displacement micro drive mechanism, which does not require a capacitor, will not generate electromagnetic effects, nor will it generate electrothermal effects. Therefore, this mechanism will not affect the operation of other components and improves the operation accuracy of the equipment. The angular displacement micro drive mechanism of this invention does not use piezoelectric ceramics and has a low cost. The moving workbench is designed with thin spring sheets, which can eliminate vibrations during movement and provide high-precision transmission. Brief Description of the Drawings

[0006] Figure 1 is a schematic diagram of an angular displacement micro drive mechanism of this invention

[0007] Figure 2 Input shaft

[0008] Figure 3 Power output shaft

[0009] Figure 4 Hollow shaft

[0010] Figure 5 Intermediate shaft

[0011] Figure 6 Planet carrier

[0012] Figure 7 Cross-sectional view of the rotating workbench

[0013] Figure 8 Figure 7 View A of

[0014] In the figure, 1 is the input shaft, 2 is the hollow shaft, 3 is Gear I, 4 is snap ring I, 5 is snap ring II, 6 is sleeve I, 7 is Gear IV, 8 is the power output shaft, 9 is sleeve II, 10 is bearing I, 11 is bearing end cover I, 12 is bolt I, 13 is the rotating workbench, 14 is bearing II, 15 is bearing end cover II, 16 is bolt II, 17 is Gear III, 18 is the shaft sleeve, 19 is the intermediate shaft, 20 is the planet carrier, 21 is Gear II, 22 is sleeve III, 23 is the bracket, 24 is bearing III, 25 is bearing end cover III, 26 is bolt III, 27 is bearing IV, 28 is bearing end cover IV, 29 is the worm gear, 30 is the worm, 31 is the sealing ring, 32 is bolt IV, 33 is the retaining ring, 34 is the spring washer, 35 is the nut, 36 is the housing, 101 is spline I, 102 is snap ring groove II, 103 is the light hole, 104 is the input shaft boss, 201 is snap ring groove I, 202 is spline II, 203 is the hollow shaft boss, 204 is the fixed shaft section, 205 is the fixed boss, 801 is spline III, 802 is the external thread, 803 is the smooth shaft section, 804 is the power output shaft boss, 1301 is the fixed seat 1301, 1302 is the thin spring plate, 1303 is the workbench, 1901 is the long spline, 1902 is the smooth shaft section, 1903 is the short spline, 1904 is the intermediate shaft boss, 2001 is the light hole, 2002 is chamfer I, 2003 is the internal spline, 2004 is chamfer II. Detailed implementation mode

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] The present invention provides an angular displacement micro-driving mechanism. The angular displacement micro-driving mechanism includes an input shaft 1, a hollow shaft 2, a gear I 3, a first snap ring 4, a second snap ring 5, a first sleeve 6, a gear IV 7, a power output shaft 8, a second sleeve 9, a first bearing 10, a first bearing end cover 11, a first bolt 12, a rotating workbench 13, a second bearing 14, a second bearing end cover 15, a second bolt 16, a gear III 17, a bushing 18, an intermediate shaft 19, a planet carrier 20, a gear II 21, a third sleeve 22, a bracket 23, a third bearing 24, a third bearing end cover 25, a third bolt 26, a fourth bearing 27, a fourth bearing end cover 28, a worm gear 29, a worm 30, a sealing ring 31, a fourth bolt 32, a retaining ring 33, a spring washer 34, a nut 35, and a housing 36. It is characterized in that: the hollow shaft 2 passes through the shaft hole of the housing 36 and is fixed to the housing 36 by the fixed shaft section 204 and the fixed boss 205 on the hollow shaft 2 by the fourth bolt 32. The fourth bolt 32 also fixes the fourth bearing end cover 28. The gear I 3 is installed on the spline II 202 on the hollow shaft 2 through splines and is pressed against the hollow shaft boss 203 on the hollow shaft 2 by the first snap ring 4. The gear II 21 and the gear I 3 are in backlash-free meshing, and backlash-free meshing can ensure precise transmission accuracy. The hollow shaft 2 is of a hollow shape. The input shaft 1 is installed on the housing 36 through the hollow shaft 2 by the fourth bearing 27. The worm gear 29 is fixed to the end of the input shaft 1 by the second snap ring 5. The worm gear 29 meshes with the worm 30. Both ends of the worm 30 are installed on the housing 36 through bearings, and the worm 30 can rotate freely relative to the housing 36. The planet carrier 20 is installed on the spline I 101 on the input shaft 1 by using the internal spline 2003 and is pressed against the input shaft boss 104 on the input shaft 1 by the second snap ring 5. The shaft section 803 of the power output shaft 8 is installed in the light hole 103 of the input shaft 1. The shaft section 803 of the power output shaft 8 and the light hole 103 of the input shaft 1 are in interference fit, and interference fit can ensure precise transmission accuracy. The gear IV 7 is installed on the spline III 801 of the power output shaft 8 through splines and is pressed against the power output shaft boss 804 of the power output shaft 8 by the second sleeve 9. The power output shaft 8 is installed on the housing 36 through the second sleeve 9 and the first bearing 10. The first bearing end cover 11 is fixed to the housing 36 by the first bolt 12 and is pressed against the outer ring of the first bearing 10. The other end of the power output shaft 8 has an external thread 802. The rotating workbench 13 is installed on the external thread 802 of the power output shaft 8 and is fastened to the power output shaft 8 by the nut 35, the spring washer 34, and the retaining ring 33. The rotating workbench 13 is composed of a fixed seat 1301, a thin spring plate 1302, and a workbench 1303. The thin spring plate 1302 connects the fixed seat 1301 and the workbench 1303. When performing angular displacement driving, the power output shaft 8 drives the fixed seat 1301 to rotate, and the fixed seat 1301 drives the workbench 1303 to rotate through the thin spring plate 1302. The thin spring plate 1302 can eliminate vibrations during movement and improve transmission precision.The left end of the intermediate shaft 19 is installed in the inner ring of the second bearing 14, the outer ring of the second bearing 14 is installed on the bracket 23, the second bearing end cover 15 is fixed on the bracket 23 by the second bolt 16 and presses the outer ring of the second bearing 14. The right end of the intermediate shaft 19 is installed in the inner ring of the third bearing 24, the outer ring of the third bearing 24 is installed on the bracket 23, the third bearing end cover 25 is fixed on the bracket 23 by the third bolt 26 and presses the outer ring of the third bearing 24. The intermediate shaft 19 is designed with a long spline 1901 and a short spline 1903. The third gear 17 is engaged with the long spline 1901 on the intermediate shaft 19 through the spline. The preferred spline form is the involute spline, which has good centering and improves the installation accuracy. The second gear 21 is installed at the short spline 1903 on the intermediate shaft 19, and is pressed against the intermediate shaft boss 1904 on the intermediate shaft 19 under the action of the third sleeve 22 and the inner ring of the third bearing 24. The planet carrier 20 is installed on the optical axis section 1902 of the intermediate shaft 19. The optical hole 2001 of the planet carrier 20 and the optical axis section 1902 of the intermediate shaft 19 are in transition fit to ensure that the optical hole 2001 is in close contact with the middle optical axis section 1902 and can rotate freely relative to each other.

[0017] In a kind of angular displacement micro-driving mechanism of the present invention, the driving force during operation is transmitted from the worm 30 to the worm wheel 29, and is transmitted to the planetary mechanism composed of the input shaft 1, the star carrier 20, the intermediate shaft 19, the first gear 3, the second gear 21, the third gear 17, the fourth gear 7, and the power output shaft 8 through the worm wheel 29. The power transmitted to the worm wheel is first transmitted to the input shaft 1, the input shaft 1 drives the star carrier 20 to rotate, further the intermediate shaft 19 rotates, the rotation of the intermediate shaft 19 drives the second gear 21 and the third gear 17 to rotate. The third gear 17 and the fourth gear 7 are meshed without backlash. Finally, the power is transmitted to the rotating workbench 13 through the fourth gear 7 and the power output shaft 8 to realize the angular displacement micro-driving of the rotating workbench 13. In the angular displacement micro-driving mechanism, let the number of teeth of the first gear 3 be z 3， The number of teeth of the second gear 21 be z 21 , the number of teeth of the fourth gear 7 be z7, and the number of teeth of the third gear 17 be z 17 , then, the transmission ratio from the input shaft 1 to the power output shaft 8 is i 18 =1 - z 17 z 3 / z 7 / z 21 , preferably z7 = 100, z 17 = 101, z 21 = 100, z3 = 99, i 18=1-101x99 / 100 / 100=0.0001, assuming that the transmission ratio of the worm gear is i1, then the total transmission ratio from the worm 30 to the power input and then to the rotating workbench 13 is the product of the worm gear transmission ratio and the planetary mechanism transmission ratio i 总 = i1xi 18 Since the transmission of the worm gear can be very large, even to one thousandth, the total transmission ratio of the angular displacement drive mechanism of the present invention can reach one ten-millionth, which can realize precise angular displacement transmission.

[0018] Finally, it should be noted that the above examples are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and there are many variations. All variations that can be directly derived or associated with the disclosure of the present invention by a person skilled in the art should be considered as the protection scope of the present invention.

Claims

1. An angular displacement micro-driving mechanism, the angular displacement micro-driving mechanism comprising an input shaft (1), a hollow shaft (2), a gear I (3), a first snap ring (4), a second snap ring (5), a first sleeve (6), a gear IV (7), a power output shaft (8), a second sleeve (9), a first bearing (10), a first bearing end cover (11), a first bolt (12), a rotating workbench (13), a second bearing (14), a second bearing end cover (15), a second bolt (16), a gear III (17), a bushing (18), an intermediate shaft (19), a planet carrier (20), a gear II (21), a third sleeve (22), a bracket (23), a third bearing (24), a third bearing end cover (25), a third bolt (26), a fourth bearing (27), a fourth bearing end cover (28), a worm gear (29), a worm (30), a sealing ring (31), a fourth bolt (32), a retaining ring (33), a spring washer (34), a nut (35), and a housing (36), characterized in that: The hollow shaft (2) passes through the shaft hole of the box body (36) and is fixed to the box body (36) by the fixed shaft section (204) and the fixed boss (205) on the hollow shaft (2) with bolt four (32). Bolt four (32) also fixes the bearing end cover four (28). The gear (I3) is installed on the spline two (202) on the hollow shaft (2) through splines and is pressed against the hollow shaft boss (203) on the hollow shaft (2) by the snap ring one (4); the gear II (21) meshes with the gear I (3) without backlash. The hollow shaft (2) is of a hollow shape. The input shaft (1) is installed on the box body (36) through the hollow shaft (2) and the bearing four (27); the planet carrier (20) is installed on the spline one (101) on the input shaft (1) by using the internal spline (2003), and the planet carrier (20) is pressed against the input shaft boss (104) of the input shaft (1) by the snap ring two (5). The shaft section (803) of the power output shaft (8) is installed in the light hole (103) of the input shaft (1). The shaft section (803) of the power output shaft (8) and the light hole (103) of the input shaft (1) are in a transition fit, and the transition fit can ensure precise transmission accuracy; the gear IV (7) is installed on the spline three (801) of the power output shaft (8) through splines and is pressed against the power output shaft boss (804) of the power output shaft (8) by the sleeve two (9). The power output shaft (8) is installed on the box body (36) through the sleeve two (9) and the bearing one (10). The bearing end cover one (11) is fixed to the box body (36) by the bolt one (12) and is pressed against the outer ring of the bearing one (10). The other end of the power output shaft (8) has an external thread (802). The rotating workbench (13) is installed on the external thread (802) of the power output shaft (8) and is fastened to the power output shaft (8) by the nut (35), the spring washer (340), and the snap ring (33); the rotating workbench (13) is composed of a fixed seat (1301), a thin spring plate (1302), and a workbench (1303). The thin spring plate (1302) connects the fixed seat (1301) and the workbench (1303). When performing angular displacement drive, the power output shaft (8) drives the fixed seat (1301) to rotate, and the fixed seat (1301) drives the workbench (1303) to rotate through the thin spring plate (1302).

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